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3D Depth Profile Reconstruction of Segregated Impurities Using Secondary Ion Mass Spectrometry
Published on: April 29, 2020
Intermixing of intrabasin and interbasin diffusion of a single Ag atom on Si(111)-(7 x 7)
Kedong Wang1, Gang Chen, Chun Zhang
1Department of Physics, The Chinese University of Hong Kong, Shatin, New Territory, Hong Kong, China. kdwang@phy.cuhk.edu.hk
Abstract:
Using scanning tunneling microscopy, we studied the diffusion of single Ag atoms within the Si(111)-(7 x 7) unit cell. A striking difference was observed in the time-dependent tunneling current spectra for Ag atoms moving in the unfaulted and faulted half unit cells, with a dual-time characteristic in the former but a single time in the latter. Our observations demonstrate the importance of the stacking fault in affecting the interaction between Ag atoms and the Si(111)-(7 x 7) surface and can be understood in terms of an asymmetric interplay between intrabasin and interbasin diffusion.
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